Can anyone address Derek's question? You can use the Comment feature below.
I have just obtained a 1930's gledhill brook time recorder, however although the movement looks like the usual movement, this movement does not have a fusee!
The power is from a (now broken) OPEN spring. This appears unusual in a gledhill brook clock. The broken spring has appeared to have damaged some teeth.
So I was just wondering if anyone else has seen this variant?